Slot-cutting machine



vE. J. ARMSTRONG. SLOT CUTTING MACHINE- APPLlcATIoN msn sEPLzz. 1920.

INVENTOR ATTOR E. 4l. ARMSTRONG.

SLOT CUTTING MACHINE. APPLICATION FILED SEPT. 22. 1920.

1,432,011. mma oet. 17,1922..

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I VENoH ATTONEY E. J. ARMSTRONG.

sLoT cuTTmG MACHINE.

` i APPLICATION FILED SEPT. 22| 1920- '4 1,432,01 1 Patented Oat. 17,1922. v

5 SHEETS-SHEET 3.

.en FH INVENTOR if? #Cif ATTORNEY E. l. ARMSTRQNG. SLOT CUTTING MACHINE.APPLlcArlon man SEPT. :z2`l 1920.

Patented Oct. 17, 19212.

s SHEETS-shin 4.

ATTORNEY E. J. ARMSTRONG.

SLOT CUTTING MACHINE. APPLICATIQNHLED SEPT. 22. 1920.

1,432,011. Patented 0015.174922.

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l /IZ' gli! 97 IXNT R m @zdf/fm AT ONEY EQ I. ARMSTRONG. SLOT CUTTINGMACHINE. APPLICATION FILED SEPVT. 22, I920 1,432,01 1, Patented ont.17,1922.

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I INVENTOR I L ATTORNEY j atenteel @et i7, 1922.

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EDWIN J. ARMSTRONG, OF ERIE, PENNSYLVANIA, ASSIGNOR TO FREDERICK IB.MCBRIER, 0F ERIE, PENNSYLVANIA.

snor-CUTTING MACHINE.

Application led September 22, 1920.` Serial No. 412,009.V

T0 all whom t may concern.'

Be it lrnown thatl, EDWIN J. ARMSTRONG, a citizen of the United Sta-tes,residing at Erie, in the county of Erie and State of Pennsylvania, haveinvented new and useful Improvements in a Slot-Cutting Machine7 of whichthe following is a. specification. i

Thisinvention is designed for making slots with one side of the slotclosed and particularly with one end of the slot inclined. It isparticularly designed to slot a wrench in which there is a fixed jaw, amovable jaw, a guiding surface for the `movable jaw, and a slotextending from theiguiding surface into the body of the wrench, one sideof the slot being formed by a drilled opening, the slot extendingendwise in an inclined direction under the lined jaw,` the slot in crosssection being ofhey-liole shape.

In carrying out niy invention l reciprocate a tool and move lthematerial from the guiding surface into the drilled opening. Thedirection of reciprocatioii follows the inclination of the end of theslot. This permits of the use of an ordinary cutting tool and simpliesthe making of this type of wrench.

The invention is illustrated in the accompanying drawings as follows:-

Fig. 1 shows a front elevation of the machine. j

Fig. 2 a rear elevation of the machine.

Fig. 3 a plan view of the machine.

Fig. 4 a side view of the end of the wrench showing the form of theslot. t

Fig. an enlarged view` of the clamping mechanism. I

Figs. 6, 7 and 8 details of the clamp or workholding mechanism.

Fig. 9 an elevation of the automatic stop mechanism.

Fig. 10 an elevation of the latch forming part of the automatic stopmechanism. 1 marks the table of the machine and 2 the legs on which itis mounted, the table being secured to the legs hy bolts 3. An uprightframe 4 is mounted on the table being secured by screws 4a.

A tool holder is carried in a reciprocating arm 5. This arm is mountedon a shaft' 6 locked there-on by a key 7. The end of the arm is split at8 and a clamping screw 9 is provided for clamping the arm on the shaftvso as to make the arm rigid with the shaft.

A tool l() is carried ina tool-holder 11, the rear of the tool beingengaged by an adjusting screw 12 and the tool being clamped in theyholder hy thescrews 13. The tool has a reciprocating motion forconvenience. In thel form shown the reciprocation is in the formofoscillations on the shaft 6. The arc, however, is such that the curveof the finished cut does not interfere with the finished article. Theshaft 6 is journaled in hearings 14 and 15 in the frame. A rock arm 1Gisl locked with the opposite end of the shaft from the arm 5. A pin 17connects the roch arm 16 with a pitman or connecting rod 18. Theconnecting rod 18 has a strap or crank'bearing 19 which operates on acraiilr 20. The crank 20 is formed in the drive shaft `21. The driveshaft 21 is mounted in bearings 22 on the frame 4 and is provided withtight and loose pulleys 23 and 24. The wrench 25 has an opening26 in theend of the handle. lt is provided with a xed jaw 27 with a guidingsurface 2S on which a moving jaw operates, a drilled opening 29 and aslot 30 extending from the face 28 into the drilled opening. The end of`the slot is inclined at 31 to permit of the extension of the projectionon the movable jaw as hereinbefore expressed.

The work-carrying and feeding mechanism is as follows: A work carrier 32has the guide extensions 33 and 34. The extension 33 operates in a guideopening 35 in the frame 4 and the extension 34 in a guide 36 on amovable plate 35'h1 at the top of the frame. The carrier has anextension 37 which has an off-set 38 (see Fig. 3) on which a plate 39 issecured by means of screws 40. lThis forms a groove which engages aguide 4l on the frame and loclis the carrier against swinging on theguides 33 and 34. A plate 42 is secured on the extension 3T by a screw43, the plate having a slot 44 (see dotted lines) to permit ofadjustment and a set screw 45 is arranged at the end of the plate forconvenience in adjusting the plate on the extension. The bottom of theplate is provided with a pin 46 which extends into a `rock lever 47. Awheel 48 is mounted at one end of the rock lever and awheel 49 at theopposite end of the rock lever, The wheel 48 rides the cam 50.` The cam50 is locked on a shaft 51 secured by a nut 52. The shaft 51 isjournaled in bearings (not shown) on the frame. A ratchet wheel 53 issecured to the opposite end of the shaft 51 by means of a nut 54 andlocked against rotation on said shaft.

It will readily be seen that as thecam is rotated it operating on thewheel 48 gradually lifts the work-carrier until the wheel 48 passes olfthe end of the cam when it permits the work-carrier to drop preparatoryto a second operation. The ratchet wheel is actuated by a pawl 56. Thepawl 56 is carried by a .pin 57 on a plate 58; The plate 58 is securedby a screw 59 to the end of the shaft 6. The screw extendsthrough a slot60 by means of which the eccentricity of the plate may be adjusted so asto vary the throw of the pawl. A set screw 61 is arranged in an ear 62on the arm 16 by means of which the plate may be locked against movementunder the thrust of the pawl. The pawl extends past an off-set lever 63,this lever being mounted on a screw 64 extending from the frame. Thelever is provided with a pin 65 which, when the lever is operated,operates against the pawl to disengage it from the ratchet wheel. Aspring 66 yieldingly holds thepawl in engagement with the ratchet wheel.A holding pawl 67 is mounted on a screw 68 extending' from the frame.The spring 66 also operates on the holding .pawl and keeps itinengagement with the ratchet wheel. A pin 69 extends from the lever 63 inposition to operate on the-holding pawl 67 to throwit out of engagementwhen the lever is operated. When these are thrown out of engagement itpermits of a free movement of the cam for setting the machine. It willbe noted that as the arm 16 is oscillated the ratchet pawl isreciprocated and the ratchet wheel moved forward .to effect thestep-by-step movement of the cam 50 so as to effect the feeding of thework-carrier.

In order to back off the work from the tool `on the return stroke Iprovide a cam 70 on the drive .shaft 21 which operates on the wheel 49at the end of the rock lever 47. Thecam 70 is so formed that on thereturn stroke of the arm 5 the roller 49 drops into a depression in thecam and this allows a slight backward movement of the carrier and justprevious to the forward stroke of the tool carrying arm the lever 47 isagain lifted to its normal position and held in this position during thecut. Thus the cam 70 operates to back off the work and the cam 50progressively feeds the work forward.

belt shifter 71 is mounted on a rock arm 72, the rock arm beingpivotally mounted on -a pinl 74, the pin extending through the ears 73on a bracket 78a extending from the frame.v A link 75 extends from thebelt shifter to a throw-off lever 76. The throwofi' lever is pivotallymounted on a pin 77 carried by an extension or bracket 77fL on .f theframe. A latch 78 is pivotally mounted at 79 on the extension 7 7a andthe latch has a projection which extends into the latch notch 80 in thelever 76. The latch is provided with an extension 81 by which it may bemanually disengaged if desired. An escapement lever 82 is pivotallysecured on the latch78 by means of a screw 83. A spring 84 is coiled ona pin 85 on the extension 77a, one end resting against a pin 86 and 'theopposite end against a pin 87 on the escapement lever 82. The escapementlever has a projection 88 which engages the pin 79, the pin thusforming-a stop for the lever 82. It also has a projection 89 which is inthe path of a pin 90 extending from the plate 89 on the carrierextension 37.

Vhen the cam 50 reaches its extreme throw and drops into the low surfaceof the cam thus permitting the work carrier to drop the pin 90 iscarried downwardly and engages the projection 89 and the end of theescapement lever being in engagement with the pin 79, latch 78 and lever82 swing together thus pulling the latch out of engagement with thelever 76 and permitting said lever to operate to throw the belt on tothe loose pulley thus stopping the machine. The weight of the rock leverand parts with the pivotal mounting at the inside furnishsufficientpower to .shift the belt, the parts swinging to the positionshown in dash lines in Fig. 9. When the carrier is moved upwardly in thefeeding movement the escapement lever 82 simply swings on the pin 83allowing the pin 90 to pass without disturbing` the latch 78. j

A clamp plate 91 is mounted on the workcarrier 32. It has a clampingface 92 which is adapted to engage the fixed jaw 27 and the face 28 ofthe wrench. A pin 93 extends through the opening 26 in the wrenchhandle. The pin 93 is carried by a plate 94 secured to the extension 37of the work carrier. A clamping plate 95 has a lip 96 which engages theside of the wrench when in place (see Figs. 6, 7 and 8). It is providedwith a wedge surface 97 which engages the rear face of the wrench andcrowds the j aw 27 and face 28 into engagement with the block 92. Theplate 95-has an extension 98 with a bevelled end 99, the bevelled endoperating on a bevelled surface 100 on the work-carrier so that as theplate is drawn down the wedge surface 100 also operates to force'thewrench intoengagement with the block 92. f

The clamping plate 95 is mounted on a rod 101 and secured thereon by anut 102. The rod extends through a spring housing 103 having the opening104 in which the spring 105is placed. A cap 106 is arranged on the rearend of the rod 101 and the spring 105 operates against this cap. The capoperates against a nut 107 and as the cap is moved outwardly against thenut through` the influence of the spring pressure the clamp is set. Alever 108 has a thrust surface 109 operating against the cap 106. Thelever is mounted on a pin 110 on the housing 103. It is connected by alink 111 with a foot lever 113, a pin 112 securing the link to thelever. When it is desired to release the clamp the foot lever isdepressed, thus depressing the lever 108. The thrust surface 109 engagesthe cap 106 and crowds the spring inwardly and permits the release 0fthe clamp.

It will be noted that the feed is in a line of an acute angle to thepath of the tool so that at the completion of the feeding action thereare the inclined ends of the slot providing for the projection on themovable jaw of the wrench as before described. The drilled opening 29having its axis at a-a permits of the clearance into which the toolextends at the completion of its cut and as the feeding movementadvances the line marking the end of the tool at the extreme forward endof its reciprocation extends along the drilled opening. The end of thereciprocation of the cutter follows along the line of the drilledopening because the feeding movement is in a line at an acute angle tethe line of the cut.

lWhat I claim as new is 1. In a slot cutting machine, the combination ofa tool-holding member; a workliolding member; means for reciprocatingsaid members relativelyT to each other; and feeding devices advancingsaid members relatively to each other, said means and devices operatingto make the line marking the end of the reciprocations at an angle otherthan a right angle to the line of reciprocating movement.

2. In a slot cutting machine, the combination of a tool-holding member;a workholding member; means for reciprocating said members relatively`to each other; and feeding devices advancing said members relatively toeach other, said means and devices operating tomake the line marking the.end of the reciprocations at an acute angle to the line ofreciprocating movement.

3. In a slot cutting machine, the combination of a tool-holder; awork-holder; means for reciprocating the tool-holder; and devices foradvancing the work-holder, the line traversed by the end of the toolcarried by the tool-holder relatively to the work carried by thework-holder being at an angle other than a right angle to the line ofreciprocating movement.

4. In a slot cutting machine, the combination of a tool-holder; awork-holder; means for reciprocating the tool-holder; and devices foradvancing the work-holder, the line traversed by the end of the toolcarried by the tool-holder relatively to the work carried by thework-holder being at an acute angle to the line of reciprocatingmovement.

5. In a slot cutting machine, the combination of a tool-holder; awork-holder; means for reciprocating the tool-holder, the forward pointof travel being constant; and a feeding device for the work-holderadvancing the work-holder in a line other than a right angle to the lineof reciprocating movement.

6. In a slot cutting machine, the combination of a tool-holder; awork-holder; means for reciprocating the tool-holder, the forward pointof travel being constant; and a feeding device for the work-holderadvancing the work-holder in a line forming an acute angle to the lineof reciprocating movement.

7. In a slot cutting machine, the combination of a tool-holding member;a workholding member; means for reciprocating said members relatively toeach other; feeding devices advancing said members relatively to eachother, said means and devices operating to make the line marking the endof the reciprocations at an angle other than a right angle to the lineof reciprocating movement; and mechanism automatically backing oif thefeeding movement on the return reciprocation.

8. In a slot cutting machine, the combination of a tool-holder; awork-holder; means for reciprocating the tool-holder; devices foradvancing the work-holder, the line traversed by the end of the toolcarried by the tool-holder relatively to the work carried by thework-holder being at an angle other than a right angle to the line ofreciprocating movement; and mechanism automatically backing off thefeeding movement on the return reciprocation.

9. In a slot cutting machine, the combination of a tool-holder; awork-holder; means for reciprocating the tool-holder, the forward pointof travel being constant; a feeding device for the work-holder advancingthe work-holder in a line other than a right angle to the line ofreciprocating movement; and mechanism automatically backing off thefeeding movement on the return reciprocation.

10. In a slot cutting machine, the combination of a tool-holding member;a workholding member; means for reciprocating said members relatively toeach other; feeding devices advancing said members relatively to eachother, said means and devices operating to make the line marking the endof the reciprocations at an angle other than a right angle to the lineof reciprocating movement; and an automatic stop mechanism automaticallystopping the machine at a pre-determined point in the feeding movement.

11. In a slot cutting machine, the combination of a tool-holder; aWork-holder; means for reciprocating the tool-holder; dcvicesforadvancing' the Work-holder, the line traversed bythe end of the toolcarried by the tool-holder relatively to the Work carried bythevvork-holder being at an angle other than a right angle to the lineof reciprocating movement; and an automatic stop mechanism automaticallystopping the machine at a predetermined point in the feeding movement.

12. In a slot cutting machine, the combination of a tool-holder; aWork-holder; means for reciprocating the tool-holder, the

f forward point of travel being constant; a

feeding device for the Work-holder advancing the Work-holder in a lineother than a right angle to the line of reciprocating movement; and anautomatic stop mechanism au y tomatically stopping the machine at apredetermined point in the feeding movement 13. In a slot cuttingmachine, the combi. nation of a tool-ho-lding member; aWorkholdingmember; means for reciprocating said members relatively toeach other; feeding devices advancing said members relatively to eachother, said means and devices operating to make the line marking the endof the reciprocations at an angle other than a right angle to the lineof reciprocating movement; and means automatically returning the memberhaving the feeding movement at the completion of the Work'.

14. In a slot cutting machine, the combination of a tool-holder; aWork-holder; means for reciprocating the tool-holder, the forward pointof travel being constant; a feeding device for the Work-holderadvancing` the Work-holder in a line other than a right angle to theline of reciprocating movement; and means for automatically returningthe Work-holder at the completion of the Work 15. In a slot cuttingmachine, the combination of a reciprocating tool-holder; a Work carrier;a cam advancing the Work carrier;

a ratchet connected with the cam; and a pawlmoving With the tool-holderand acting on the ratchet to actuate the cam.

16. In a slot cutting machine, the combination of a reciprocatingtool-holder; a Work carrier; a cam advancing the work carrier; a ratchetconnected with the cam; and a pawl moving With the tool-holder andacting on the ratchetto actuate the same, said cam having a depressionpermitting the return of the carrier at the completion of the cycle.

17. In a slot cutting machine, the combination of a reciprocatingtool-holder; a Work carrier; a cam advancing the Work carrier; a rachetconnected with the cam; a pavvl moving' with the tool-holder and actingon the ratchet to actuate the cam; and a second cam operating inconnection With the first cam With each reciprocation of the toolholderfor backing off the Work.

18. In a slot cutting machine, the combination of a Work carrier; a rocklever carrying the Work carrier; a cam operating at each endof the rocklever, one cam arranged to progressively advance the Work and the othercam operating to back off the Work for the return of the cutting tool;and a reciprocating tool carrier connected With the backing-off cam. V

19. In a slot cutting machine, the combination of a Work carrier havinga feeding movement and a return movement at the completion of the slot;a stop mechanism; and means for actuating the stop mechanism upon thereturn movement of the Work carrier. y i

20. In a slot cutting machine, the combination of a work carrier havingan advance movement for the Work and a return movement; a belt shifter;a latch locking the belt in driving position; and trip mechanismoperated by the return movement of the Work carrier for releasing thebelt shifter to shift' the belt to non-driving position.

21. In a slot cutting machine, the combination of a Work carrier; a cammounted 0n the Work carrier comprising a clamping block; and a clampingplate having a lip and Wedge surface for clamping the Work in twodirections against the block andthe face of the carrier.

22. In a slot cutting machine, the combination of a Work carrier; aclampinfr block on the Work carrier; aclamping plate; a wedge surfaceoperating on the clamping plate; and an overhanging surface on theclamping plate whereby the Work is clamped against the face of the Workcarrier and moved edgewise against the block.

23. In a slot cutting machine, thecombination of a Work carrier; aclamping plate for holding the Work; a rod extending from the clampingplate; a spring operating on the rod to move the clamp to clampingposition and a lever mechanism for releasing the clamp.

24. In a slot cutting machine, the combination of a Work carrier; aclamping plate for holding the Work; a rod extending from the clampingplate; a spring operating on the rod to move the clamp to clampingposition; and a foot lever for releasing the clamp.

In testimony whereof I have hereunto set my hand.

EDWIN ARMSTRONG.

